cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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stats.c (4494B)

      1/*
      2 * Copyright (c) 2006 Oracle.  All rights reserved.
      3 *
      4 * This software is available to you under a choice of one of two
      5 * licenses.  You may choose to be licensed under the terms of the GNU
      6 * General Public License (GPL) Version 2, available from the file
      7 * COPYING in the main directory of this source tree, or the
      8 * OpenIB.org BSD license below:
      9 *
     10 *     Redistribution and use in source and binary forms, with or
     11 *     without modification, are permitted provided that the following
     12 *     conditions are met:
     13 *
     14 *      - Redistributions of source code must retain the above
     15 *        copyright notice, this list of conditions and the following
     16 *        disclaimer.
     17 *
     18 *      - Redistributions in binary form must reproduce the above
     19 *        copyright notice, this list of conditions and the following
     20 *        disclaimer in the documentation and/or other materials
     21 *        provided with the distribution.
     22 *
     23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     30 * SOFTWARE.
     31 *
     32 */
     33#include <linux/percpu.h>
     34#include <linux/seq_file.h>
     35#include <linux/proc_fs.h>
     36#include <linux/export.h>
     37
     38#include "rds.h"
     39
     40DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
     41EXPORT_PER_CPU_SYMBOL_GPL(rds_stats);
     42
     43/* :.,$s/unsigned long\>.*\<s_\(.*\);/"\1",/g */
     44
     45static const char *const rds_stat_names[] = {
     46	"conn_reset",
     47	"recv_drop_bad_checksum",
     48	"recv_drop_old_seq",
     49	"recv_drop_no_sock",
     50	"recv_drop_dead_sock",
     51	"recv_deliver_raced",
     52	"recv_delivered",
     53	"recv_queued",
     54	"recv_immediate_retry",
     55	"recv_delayed_retry",
     56	"recv_ack_required",
     57	"recv_rdma_bytes",
     58	"recv_ping",
     59	"send_queue_empty",
     60	"send_queue_full",
     61	"send_lock_contention",
     62	"send_lock_queue_raced",
     63	"send_immediate_retry",
     64	"send_delayed_retry",
     65	"send_drop_acked",
     66	"send_ack_required",
     67	"send_queued",
     68	"send_rdma",
     69	"send_rdma_bytes",
     70	"send_pong",
     71	"page_remainder_hit",
     72	"page_remainder_miss",
     73	"copy_to_user",
     74	"copy_from_user",
     75	"cong_update_queued",
     76	"cong_update_received",
     77	"cong_send_error",
     78	"cong_send_blocked",
     79	"recv_bytes_added_to_sock",
     80	"recv_bytes_freed_fromsock",
     81	"send_stuck_rm",
     82};
     83
     84void rds_stats_info_copy(struct rds_info_iterator *iter,
     85			 uint64_t *values, const char *const *names, size_t nr)
     86{
     87	struct rds_info_counter ctr;
     88	size_t i;
     89
     90	for (i = 0; i < nr; i++) {
     91		BUG_ON(strlen(names[i]) >= sizeof(ctr.name));
     92		strncpy(ctr.name, names[i], sizeof(ctr.name) - 1);
     93		ctr.name[sizeof(ctr.name) - 1] = '\0';
     94		ctr.value = values[i];
     95
     96		rds_info_copy(iter, &ctr, sizeof(ctr));
     97	}
     98}
     99EXPORT_SYMBOL_GPL(rds_stats_info_copy);
    100
    101/*
    102 * This gives global counters across all the transports.  The strings
    103 * are copied in so that the tool doesn't need knowledge of the specific
    104 * stats that we're exporting.  Some are pretty implementation dependent
    105 * and may change over time.  That doesn't stop them from being useful.
    106 *
    107 * This is the only function in the chain that knows about the byte granular
    108 * length in userspace.  It converts it to number of stat entries that the
    109 * rest of the functions operate in.
    110 */
    111static void rds_stats_info(struct socket *sock, unsigned int len,
    112			   struct rds_info_iterator *iter,
    113			   struct rds_info_lengths *lens)
    114{
    115	struct rds_statistics stats = {0, };
    116	uint64_t *src;
    117	uint64_t *sum;
    118	size_t i;
    119	int cpu;
    120	unsigned int avail;
    121
    122	avail = len / sizeof(struct rds_info_counter);
    123
    124	if (avail < ARRAY_SIZE(rds_stat_names)) {
    125		avail = 0;
    126		goto trans;
    127	}
    128
    129	for_each_online_cpu(cpu) {
    130		src = (uint64_t *)&(per_cpu(rds_stats, cpu));
    131		sum = (uint64_t *)&stats;
    132		for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
    133			*(sum++) += *(src++);
    134	}
    135
    136	rds_stats_info_copy(iter, (uint64_t *)&stats, rds_stat_names,
    137			    ARRAY_SIZE(rds_stat_names));
    138	avail -= ARRAY_SIZE(rds_stat_names);
    139
    140trans:
    141	lens->each = sizeof(struct rds_info_counter);
    142	lens->nr = rds_trans_stats_info_copy(iter, avail) +
    143		   ARRAY_SIZE(rds_stat_names);
    144}
    145
    146void rds_stats_exit(void)
    147{
    148	rds_info_deregister_func(RDS_INFO_COUNTERS, rds_stats_info);
    149}
    150
    151int rds_stats_init(void)
    152{
    153	rds_info_register_func(RDS_INFO_COUNTERS, rds_stats_info);
    154	return 0;
    155}